Photochemical Control of Reversible Encapsulation

Dube, Henry; Ajami, Dariush; Rebek, Julius

doi:10.1002/ange.201000876

Cited by 31 publications

(7 citation statements)

References 31 publications

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“…A new absorption band at 321 nm and an isosbestic point at 276 nm were observed after irradiation at 365 nm, which was originated from the photoinduced isomerization of 1 ( Supplementary Figures S27 ). The continuous heating of the solution at 80°C ultimately resulted in the recovery of original absorption bands, suggesting the regeneration of molecular loop trans - 1 ⊂CB[8] 25 . This optical switching process can be recycled for several times upon alternate exposure to UV irradiation and heating treatment ( Supplementary Figures S27 , inset).…”

Section: Resultsmentioning

confidence: 99%

Photoresponsive Supramolecular Complexes as Efficient DNA Regulator

Cheng

Zhang

et al. 2014

Sci Rep

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Two supramolecular complexes of trans-1⊂CB[8] and trans-2⊂CB[8] were successfully achieved by the controlled selective complexation process of cucurbit[8]uril (CB[8]) with hetero-guest pair containing azobenzene and bispyridinium moieties in aqueous solution, exhibiting the reversibly light-driven movements of CB[8] upon the photocontrollable isomerization of azophenyl axle components. Significantly, the obtained bistable supramolecular complexes and their corresponding [2]pseudorotaxanes could act as a promising concentrator and cleavage agent to regulate the binding behaviors with DNA molecules.

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Section: Resultsmentioning

confidence: 99%

Photoresponsive Supramolecular Complexes as Efficient DNA Regulator

Cheng

Zhang

et al. 2014

Sci Rep

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“…245 Rapid progress is being made in contriving such artificial allosteric systems. [246][247][248][249] This fantastic biomimetic system inspires chemists to design smart enzyme models with regulatory catalytic functions caused by the structural, conformational, and configurational changes via the internal or external stimulus. 29,250 Thus far, several kinds of smart enzyme mimics have been reported (Fig.…”

Section: Smart Enzyme Modelsmentioning

confidence: 99%

Artificial enzymes based on supramolecular scaffolds

2012

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Enzymes are nanometer-sized molecules with three-dimensional structures created by the folding and self-assembly of polymeric chain-like components through supramolecular interactions. They are capable of performing catalytic functions usually accompanied by a variety of conformational states. The conformational diversities and complexities of natural enzymes exerted in catalysis seriously restrict the detailed understanding of enzymatic mechanisms in molecular terms. A supramolecular viewpoint is undoubtedly helpful in understanding the principle of enzyme catalysis. The emergence of supramolecular artificial enzymes therefore provides an alternative way to approach the structural complexity and thus to unravel the mystery of enzyme catalysis. This critical review covers the recent development of artificial enzymes designed based on supramolecular scaffolds ranging from the synthetic macrocycles to self-assembled nanometer-sized objects. Such findings are anticipated to facilitate the design of supramolecular artificial enzymes as well as their potential uses in important fields, such as manufacturing and food industries, environmental biosensors, pharmaceutics and so on.

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“…4b). However, when this solution is irradiated at 365 nm for 1 hour, the trans - 1 is completely replaced by the encapsulated alkane xix. On heating this sample to 160 °C for 2 minutes, the original complex reappears and the irradiation/heating cycle can be repeated many times.…”

Section: ) Photoisomerization Of Azobenzenesmentioning

confidence: 99%

Control of nanospaces with molecular devices

Durola

Dube

Ajami

et al. 2010

Supramolecular Chemistry

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Cavitands and capsules define nanoliter spaces for recognition, isolation and reactions of small molecules. These systems are usually self-assembled and factors such as solvent size, stoichiometry, and packing factors determine what goes into the spaces. Here we examine two switching devices to control what and when guests get in and out of these hosts: bipyridyl-metal chelation and azobenzene photoisomerization. The effects are reversible by treatment with conventional chelating agents and brief heating, respectively. Accordingly, it is possible to trigger reactions that take place within a cylindrical capsule by light, even though the reaction process is not photochemical by nature. Likewise the presence of metals can regulate reactions without acting as direct catalysts.

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Photochemical Control of Reversible Encapsulation

Cited by 31 publications

References 31 publications

Photoresponsive Supramolecular Complexes as Efficient DNA Regulator

Photoresponsive Supramolecular Complexes as Efficient DNA Regulator

Artificial enzymes based on supramolecular scaffolds

Control of nanospaces with molecular devices

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